When one of his former colleagues is murdered, the outlawed, but no less determined, masked vigilante Rorschach sets out to uncover a plot to kill and discredit all past and present superheroes. As he reconnects with his former crime-fighting legion–a disbanded group of retired superheroes, only one of whom has true powers–Rorschach glimpses a wide-ranging and disturbing conspiracy with links to their shared past and catastrophic consequences for the future. Their mission is to watch over humanity–but who is watching the Watchmen?